Process of and device for manufacturing hollow bodies by means of fibrous materials



Jan. 31, 1933. RUT|sHAU5ER 1,895,687

PROCESS OF AND DEVICE FOR MANUFACTURING HOLLOW BODIES BY MEANS OFFIBROUS MATERIALS Filed May 16, 1931 Patented Jan. 31, 1933UNITEDTSTA'ITIEIS,

rnoonss or AND nEvroE 7 non "AR OLD RUTIsHAUsE or ZURICH, MSWITZERLANDApplication flied may 16, 1931, Serial u 537,894, and in Germany May 27,1930. I

Heretofore processes of manufacturing hollow bodies, such as bottles andother containers, by means of fibrous materialshave been known.According' to these processes the fibrous material in suspension in aliquid is introduced into a completely closed pervious mould in'such away that said material will be discharged from the mould through a tubewithin and near the bottom of the 10 latter. In this operation the'wallsof the mould will be charged with fibrous material from the bottom tothetop. Another process heretofore known has for its object to use areceptacle arranged above the mould and serving to'increase the pressureofthe liquid,

the formation of the hollow bodies being ef-" fected from top to bottom.U According to these known processes the hollow'bodies are firstmoulded, whereupon gaseous compressed fluid is forced into the mould forthe purpose of finishing the moulding and drying the hollow body.

The processes above mentioned are objectionable in that they areapplicable only for 125 the manufacture of hollow bodies of relativelylittle height, because the local position of the entrance of fibrousmaterial invariable in height and the static pressure decreasing withthe height enable a homogeneous de- 130 posit of fibrous material ofuniform thickness to be obtained withi'n'certain narrow limits only. 7

An apparatus is also known for the manufacture of pipes of fibrousmaterial which 735 usesa mould with a stationary position and a movablepart in connection with a core, which determines the bore of the pipeand which remains in the pipe for drying. The movable part of the mouldis under pressure of weights 40 which are of influence only upon thedensity of the deposit, but not upon the height of the zone of deposit.

My present process permits of avoiding the objections mentioned andmanufacturing hollow bodies of unlimited length by the fact A furtherfeatureof the present process con-i sists in using, simultaneously withthe forma-' tion of the walls, a gaseous compressed fluid I forfinishingand drying the moulded article.

A device for carrying the process according to my invention into effectis illustrated by wayof example in theaccompanying drawf ing, whereinFig; l is a verticalsectional view of the device showing theoperationthereof during the formation of a hollow'body. I

Fig. 2 is a vertical's'ectional View ofthe device after the completionof'the moulding operation. a i

Fig.- 3 is a transverse section on line I-J, showing the unfoldablemould. v Referring to the'drawing, a1 is a pipe; through which fibrousmaterial in suspensionin liquid is forced under pressure intoareceptacle' a2 provided with a water-gauge a3 and from which leads apipe a5 providedwitha valve a4. V

61 is apipe for gaseous compressed fluid, comprising telescopingsections 62 and b3. 02 is a branch pipe leading from the gaseous" fluidpipe bl and provided witha valve 01. i (Z1 is the completelyclosedpervious mould,

which is adapted to-be unfolded for the purpose of enabling the hollowbody to be taken from the mould after the moulding-thereof. d2 is apiston madeof the cross section-of the mould all and rigidlyconnecte'dto a stationary supporting pipe d3.

Alifting device'e, such asa Windlass orlthe like, is provided for movingthe 'mould-ver-f ticallyf The edges of the mould are provided withhinges d1,-enabl-ing the mould togbe unfolded as shown in F ig. 3. Thewall s'o'f the mould are provided with e'xtension'sd"-1,- which uponfolding the mould are brought MANUFACTURING HOLLOW BODIES Bi EANS oriFIBBOIIS MATERIALS and held together by means of suitable fasten For themanufacture of a hollowbody I I proce'ed as'follows; Fibrous materialin' sus 3 pension in a liquid is continuouslyintro duced underpressureinto the" receptacle -a2,

said material flowing 'through the pipes a5 and d3'into" themould jdl. lDuring the formation of the hollow body thelevel of liquid in the mouldwill-be held 'on a de terminate height N with relation to the pistond2by adjusting the supply of liquid.

The level N of-the liquid which corresponds to the zone of deposit offibrous material may be determined experimentally'for a hollow body ofdeterminate cross-section. During the moulding process Compressedgaseous fluid, for lnstance compressed air, steam or the like, isintroduced through the pipe 61 for the purpose of acting from inside onthe moulded part of the hollow body. vOwing t0.

, the fact'that the'compressed fluid is. also in communication with thereceptacle a2 the level of the liquid will remain invariable inproportion asliquid is, supplied through the pipe all according to theprogressive lifting of: the mould d1] Byadjusting the lifting {speedofthe mould' lgam enabled to adjust the rthickness and. density of .thedeposit;

I I moulded article are such that the gas, in-spite formed,-lthat-is thewalls of the, hollow body.

In the uppermost position the moulding of the hollow; body will becomplete." Towards its upper end said hollow body will be dried to an;increased degree. In order to quickly ous fluid through the pipes 02 andd3 into the lower: part of the mould dl, provided that'the pressure ofgas and the perviousness of the of' 'the direct communication throughb1,

b2 and 63, will force the liquid contained, in

the pipes 02, a5, and 0Z3'into the mould. all.

For the purpose of removing the hollow body from the mould the latterwill be unfolded as SEQWninFig. 3, whereupon thev mould is moved back toits lower-most. position and zthe-roperation repeated as, described.llhe length of the hollow body to be. manufactimed-will be obtained asdesired by limiting theyliftingstroke of the mould For thepu-rpose; offacilitating the removal of the hollow body'from the, mould, the lattermay;

, be arranged alsoin a position diflerent from theYQrfical position.

- I claim: I A process bodies j of fibrous materials, which consists inintroducing liquid containing the fibrousv material in suspension into apervious mould, adjusting the height of the level of liquid,

wit-hinthe mould from outside, for the purposeofinfluencing'the heightof the zone of deposit ofthe fibrous material, andsimulta- I neouslyintroducing compressed gaseous fluid above the liquid within the; mouldwhile. the

substanti ally. as described.

w f th hollow body; are being; formed, 6

, process f manufa,cturing hollow I bodies: of fibrous materials whichConsists in; introducing liquid containing the fibrous material insuspension into a pervious mould,

adjusting the; height "of, the, level of liquid within the mould fromoutside, for the purpose of influencing the height of the zone ofdeposit of the fibrous material, introducing compressed gaseous fluidabove the liquid within the mould while the walls of'the hollow body arebeing formed, and subsequently after the completion of said wallsintroducying compressed gaseous fluid into the mould from below,substantiallyas set forth.

3;: A' process of manufacturing hollow bodies. by means of,fibrousmaterials introduced in a perviou's'mould as a liquid contain"ing the fibrous material in suspension, which consists. in adjusting theheight of the level of liquid within the mould from outside, for

the purpose oiinfluencing the height of. the

zoneof deposit of the. fibrousamaterial, sub:

stantially asset forth.

5 4. In a device for manufacturing hollow bodies by means, o-ffibrous;materialsbrought in; a completelyclosed pervious :mould with astationary piston forming the bottom wall, of said mould, thecombination of means for displacing they-mould with relation to saidpiston, a receptacle containing the fibrous material in, a liquid, apipe leadingfromthef bottomotsaid receptaclegthr'ough the piston I intothe mould and supportingsaidpiston, in

such away that. the receptacle-and mould will be arranged to; term;communicating; vessels, and meansvfor. adjusting the. height-ofthe levelof liquid in said. receptacle, substantially asset-forthvu o I .A-RNQLD;

of manufacturing hollow I I no

